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Simplifying (7z + 4) + (3z + -4) + 90 = 180 Reorder the terms: (4 + 7z) + (3z + -4) + 90 = 180 Remove parenthesis around (4 + 7z) 4 + 7z + (3z + -4) + 90 = 180 Reorder the terms: 4 + 7z + (-4 + 3z) + 90 = 180 Remove parenthesis around (-4 + 3z) 4 + 7z + -4 + 3z + 90 = 180 Reorder the terms: 4 + -4 + 90 + 7z + 3z = 180 Combine like terms: 4 + -4 = 0 0 + 90 + 7z + 3z = 180 90 + 7z + 3z = 180 Combine like terms: 7z + 3z = 10z 90 + 10z = 180 Solving 90 + 10z = 180 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + 10z = 180 + -90 Combine like terms: 90 + -90 = 0 0 + 10z = 180 + -90 10z = 180 + -90 Combine like terms: 180 + -90 = 90 10z = 90 Divide each side by '10'. z = 9 Simplifying z = 9
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